Why to use Load Balancer with Floating IP?

I can notice every tutorial for using Floating IP is explained through this schematic:

I’m trying to understand why we need to use Load Balancers in combination with Floating IP ? Why not to use only pool of App servers with Floating IP (without Load Banalcers) ? When some server is down, the floating IP will be assigned to other server from the pool and the application will be still available.


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I want to implement redundant HA Proxy for Mysql Master/master configuration. As far as I know Floating IP are public, is there any way to get a private floating IP ?. For security and performance reason I don’t think that using public IP for HA Proxy in this Scenario (webservers communicating internally with database servers). Do you know any solution for this?